Measuring 505,078 and 537,000 square feet (47,000 and 50,000 square metres), the two structures will sit side by side, and feature pathways that zigzag up their inclined roofs.

These pedestrian routes will climb up alongside green spaces, offering access points at various levels and allowing cafe spaces to spill outdoors.

Glazed walls will fill the gaps between the slopes, and cover the remaining facades. Clive Wilkinson Architects has been chosen to design the interiors, while Olin will be responsible for the landscape architecture.

The two buildings are intended for general office use for around 4,500 Google employees, supplementing the creative spaces at the new headquarters, also in Silicon Valley.

The Sunnyvale site, to be known as Caribbean, will include separate central utility plants and 2,085 parking spaces, split between a garage and surface parking.

However, Google said it is committed to “reducing cars on the road by prioritising biking, shuttles, public transportation and more”.

The company expects to move in employees around 2021, and also has plans to build housing on the campus.

Meanwhile, the huge canopied structures designed by BIG and Heatherwick Studio for the Mountain View campus are moving forward.